1266541863697 has 16 divisors (see below), whose sum is σ = 1422228209472. Its totient is φ = 1117753715520.

The previous prime is 1266541863677. The next prime is 1266541863737. The reversal of 1266541863697 is 7963681456621.

It is a cyclic number.

It is not a de Polignac number, because 1266541863697 - 2²³ = 1266533475089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266541863637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3331998 + ... + 3692599.

It is an arithmetic number, because the mean of its divisors is an integer number (88889263092).

Almost surely, 2^{1266541863697} is an apocalyptic number.

It is an amenable number.

1266541863697 is a deficient number, since it is larger than the sum of its proper divisors (155686345775).

1266541863697 is a wasteful number, since it uses less digits than its factorization.

1266541863697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025088.

The product of its digits is 78382080, while the sum is 64.

The spelling of 1266541863697 in words is "one trillion, two hundred sixty-six billion, five hundred forty-one million, eight hundred sixty-three thousand, six hundred ninety-seven".